Parks

Parks come in a variety of sizes and provide a place for residents to relax and a location for the homeless to gather. These spaces can spruce up your neighborhood. Wealthier Sims will be attracted if these parks are for medium/high-density residential areas, but be careful how many you place, parks can end up costing more per hour than any other service.

Also be careful where you place parks. Placing a park in an industrial/polluted zone to spruce up the area may have the adverse effect of attracting people to the park and because of its location, making them sick, stressing your medical services, and causing unnecessary illness.

While you need to be weary of placing parks near Industrial Zones, parks and trees can be very beneficial to help deal with Air Pollution. You might have placed your Industrial areas perfectly at the start of the game, downwind, and away from any planned Residential neighborhoods. However, the wind direction can (and will) change at some point.

If you find that your residential zones now lay directly in the path of the pollution, place more parks and trees to clean up the air quality and keep your citizens healthy.

While adding parks to increase the land value is a great idea in commercial and residential zones, beware that increasing the land value in residential zones too quickly causes Abandoned Buildings to pop up with the reasons "Out of Money". when you bulldoze these homes the previous inhabitants become homeless.